What is the difference between an allosteric inhibitor and a competitive inhibitor of an enzyme? *

A. only the competitive inhibitor slows down the enzyme
B. the competitive inhibitor binds to the substrate while the allosteric one binds to the enzyme
C. the competitive inhibitor changes the shape of the active site while the allosteric inhibitor binds to the substrate to block it
D. the competitive inhibitor binds to the active site blocking the substrate, while the allosteric inhibitor does NOT bind to the active site.